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P1 = 2*2
P2 = 1/2 * 2 * 3 = 3
Pc = P1 + 4P2 = 16
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P1 = 2*4 = 8
P2 = 1/2 * 4 * 4 = 8
P3 = 1/2 * 2 * 4 = 4
P4 = 1/2 * 4 * 4 = 8
Pc = P1 + P2 + P4 + 2P3 = 32
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P1 = 1/2 * 3 * 3 = 4.5
P2 = ((√18)^2 * √3) / 4 = 4.5√3
Pc = 3P1 + P2 = 13.5 + 4.5√3